Scepter 3 Gallon Marine Fuel Tank - Under-Seat Slim Gas Can with 2‑Way Vented Cap & Built‑In Gauge

The Scepter 3 Gallon Portable Marine Gas Can is a slim, under-seat fuel tank with a two-way vented cap, integrated sight gauge/pick-up, and a top handle for easy dock-to-boat transport.

Designed for small outboard boats, dinghies and other recreational craft, this 3-gallon (11.4 L) tank balances storage capacity with compact dimensions so it tucks under seats without sacrificing ventilation or durability. Its five-layer high-density polyethylene construction resists corrosion, UV and impact while the molded feet raise the tank from wet bilges and improve airflow. EPA and CARB approvals make it suitable for use where emissions compliance matters.

How does the two-way vented cap improve safety and refueling?

The cap allows airflow during refueling and will automatically release excess internal pressure above approximately 5 PSI to reduce vapor buildup. This reduces the chance of pressure-related leaks and makes topping up fuel faster and more predictable. It is also compatible with ethanol-blended fuels and diesel.

• Automatic overpressure release near 5 PSI to prevent vapor accumulation
• Enables controlled airflow during fill-ups for smoother venting
• Works with ethanol blends and diesel for flexible marine use

How do I check fuel level and connect my outboard?

The Scepter tank integrates a combined fuel pick-up and sight gauge along the side so you can visually confirm fuel level without unsealing the cap. The unit accepts standard 1/4 NPT marine fittings and the fuel line attaches from the side, simplifying installation on many small engines. Note that the fuel line is sold separately.

• Built-in sight gauge for quick fuel checks at a glance
• Accepts common 1/4 NPT fittings used on marine outboards
• Side-mounted pick-up connection keeps lines tidy and accessible

Is this tank durable enough for saltwater and dock use?

Scepter uses a one-piece, five-layer HDPE shell engineered to resist crush, UV, and chemical degradation—important for harsh marine environments. Because the body is non-metallic, it won’t rust or corrode like steel cans, and the multi-layer construction minimizes fuel evaporation. The molded feet lift the tank off wet surfaces to further extend service life.

• Five-layer crush-resistant HDPE prevents deformation and leaks
• Non-corroding material stands up to saltwater and sun exposure
• Molded feet improve ventilation and reduce prolonged wet contact

How large is it and how will it fit in my boat?

The compact footprint — 19.3" long x 12.2" wide x 6.8" high — is tailored for under-seat or locker placement on small craft. Its slim profile makes it easy to stow while the integrated top handle provides secure carrying between dock and boat. With 3 gallons (11.4 L) of fuel, it offers a practical range boost without taking excessive space.

• Dimensions: 19.3" L x 12.2" W x 6.8" H for under-seat storage
• Top handle for one-handed transport and secure lifting
• 3-gallon capacity gives a balance of range and compact size

Who is this for: The Scepter 3 Gallon Portable Marine Gas Can is intended for recreational boaters, anglers and tender owners who need a compact, compliant fuel source that stores easily under seats and resists harsh marine conditions. It suits those who prioritize emissions-compliant equipment, simple visual fuel checks, and a sturdy, corrosion-free tank for seasonal use or day trips.